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This is only the fifth tournament Federer has played this season. He won the Australian Open in January, the ABN Amro World Tennis Tournament in Rotterdam in February and reached the final of Indian Wells in March.

Federer has won Wimbledon eight times and this year's tournament starts on 2 July.

India's Gunneswaran, ranked 169th in the world, caused an upset on Wednesday with a 7-6 (8-6) 2-6 6-3 victory over sixth seed Denis Shapovalov of Canada, the world number 23.